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ELBVATOR BRAKE. No. 375,396. Patented Dee. 27, 1887.

Zfz 'f7/'2, ,7 j'/ Z291 I Il Insulza-Juanes i IIIIH r um?) UNITED STATES PATENT OFFICE.

RALPH L. TEED, OF CHICAGO, ILLINOIS, ASSIGNOR OF ONE-HALF TO ALEXANDER MCGUIRE, OF SAME PLACE.

ELEVATOR-BRAKE.

SPECIFICATION forming part of Letters Patent No. 375.396, dated December 27, 1887.

Application filed July 25, 1887. Serial No. 245.282. (No model.)

To @ZZ whom it may concern:

Be it known that I, RALPH L. TEED, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a certain new and useful Improvement in Elevator-Brakes, which improvement is fully set forth in the following specification, reference being had to the accompanying drawings, in which- Figure l is a plan view of a mechanism embodying my invention; Fig. 2, a front elevation of the same; Fig. 3, asectional view taken on the line 1 l of Fig. l; Fig. 4, a rear elevation of the governor-wheel; Fig. 5, a sectional view taken on the line 2 2 of Fig. 1;`Fig. 6, a detail sectional view taken on the line 3 3 of Fig. l; Fig. 7, a detail plan view of one of the gripping-levers and its jaw, and Fig. 8 a detail sectional view of a modified form of sprocket-wheel. Figs.` l, 2, and 3 are on the same scale. Figs. 4, 5, 6, and 7 are on the same scale with respect to each other, but on an enlarged scale with respect to the remaining figures.

Like letters refer to like parts in all the gnres of the drawings.

My invention relates to elevator-brakes, and

. has for its object to provide a safety device for elevators depending 'for its operation upon any increase in the speed of the elevators descent above a given point, so that upon such an increase, no matter from what cause, the descent of the car will be immediately and effectualiy checked.

I will now proceed to describe a construction in which I have practically carried out my invention in one form, and will then point out in the claims those features which'I deem to be new and desire to protect by Letters Patent.

In the drawings, A represents the elevatorcar, only so much of which is shown as is necessary to an understanding of4 my invention, and B represents the ways between which the said car travels. At each side of the car, on the top of the ends of the top cross-beam, A', thereof, are mounted the gripping-levers C. These levers are pivoted at c between plates C' and CZ, mounted on the cross-beam A', as shown, and connected by screw-bolts c to each other and to the cross-beam by screw-bolts c2.

The jaws of the gripping-leversC extend beyond the sides of the car A, embracing between them the ways B, and are preferably constructed in the manner shown. In this construction the gripping-jaws proper consist of sliding blocks C3, mounted on dovetailed ways c3 on the gripping-levers, as shown more particularly in Figs. 6 and 7 Vof the drawings. These ways are inclined to the faces of the ways B, as shown, and the blocks C3 are normally drawn down by means of springs Ct lAt the top of each block a stop, c, is provided, screwing into the block and having a head which catches over the gripping-lever and serves to limit the downward motion of said block due to the action of the spring Ci. Each pair of gripping-levers C is operated by means of-a sliding rod, D, capable of longitudinal movement in suitable bearings, d, on the crossbeam A', and provided with a conical or wedgeshaped extremity, D,which operates between the ends of the gripping-levers C. 'Fliese levers are'preferably provided with anti-friction rollers d,which bear against this conical extremity in the manner shown in Fig. l.

The sliding rods D are operated by means of bell-crank leversE, one foreach rod. Thesebellcrank levers are each pivoted at e to a suitable support, f, on the cross-beam A', and have one .end pivoted at e' to the corresponding rod D. Their other ends are provided with opposite wormgear segments, between which is arranged a worm or endless screw, G, on the shaft C', the said worm meshing with the segments E' in the manner shown.. Theshaft G' is mounted at one end in a suitable bearing,f, on the support F, an adjusting-screw, f', passing through the bearing against the end of said shaft, in order to tighten np the parts and take up wear. At its other end the shaft G' is supported in a suitable bearing on an arm, F', extending upward ,from the cross-beam A', as shown more particularly in Fig. 3.

H represents a friction-wheel splined upon the shaft G', so as to move longitudinally thereon, but rotating along with the same.` This friction-wheel is thrust normally toward the governor-wheel by means of a spring, H', coiled around the shaft G', and bearing against the hub h of friction-wheel and against a fixed collar, h', on the shaft;

ioo

I represents a bell-crank lever pivoted on the cross-beam A and having one of its arms forked, as shown at i, and provided with pins i', which enter a groove, h, in the hub of the friction-wheel H. The other arm, fi, of the bell-crank lever I is adapted to be engaged by means of a latch, J, pivoted at about its eenter on a support, j, and provided at one end with a toe, y", to engage the arm i, while its other end, j, is arranged in the path of the governor-arms, hereinafter described.

K represents the governor-wheel, which is mounted loosely upon the shaft G', and is provided with an internal friction-surface, k, to engage with the periphery of the friction-wheel H. rIhis governor-wheel is provided on its rear face with governor-arms K, pivoted at k to the wheel, and provided near their free ends with slots k2, through which pins or screwbolts K2 pass, which serve to limit the motion of said governor-arms. Springs Kn are employed to retract the governor-arms, each spring being connected at one end to a bolt or rod, k, pivoted to the tail end of one of the governor-arms, its other end bearing against the other governor-arm at a point about on the line between its pivot k and the center ofthe shaft G.

L represents a belt attached at its ends, in any suitable manner, at the top and bottom of the elevator-well and passing around the governor-wheel K, and also around an idler, L', mounted on the ear A. Preferably this belt is a link belt or sprocket-chain, in which case the governor-wheel K is a sprocket-wheel.

In Fig. S I have shown in detail the form of sprocket-wheel which I prefer to use, in which construction the said wheel is surrounded by a peripheral rim or tire of rubber, K5, through which sprockets 7s, consisting of wooden pins, pass, these latter extendingiuto sockets formed inthe wheel K to receive them. By reason of this construction the noise caused by the ruuning of the sprocket-chain over an iron wheel is entirely done away with.

Instead of employing a link belt, a plain belt or cable may obviously be substituted therefor, although I prefer the construction shown.

rlhc operation of my improved elevatorbrake is as follows: During the travel of the car at an ordinary rate of speed the parts remain in the position shown in the drawings, the governor-wheel K rotating freely upon the shaft G. In case, however, the speed is increased above the point for which the apparatus is set to act-as, for instance, on account of any slipping of the hoisting-cable or breakage of the same-the rate of rotation of the governor-wheel K will be correspondingly increased and the governor arms K will be thrown outward sufficiently to come in contact with endjl of the latch J. Upon striking this latch its toej will be lifted above the arm ft2 of thebell-crank lever I, whereupon the spring H will force the friction-wheel into contact with the governor-wheel K, thus connecting this latter to the shaft G. This shaft will then be rotated by the governor-wheel,aud the worm G thereon, acting the worm-segments E and through the belLcrank levers E upon the sliding rods D, will force these letters outward. The conical extremities D of the rods D, entering between the inner ends of the gripping-levers C, will force these ends away from each other, and will cause the grippingjaws to approach each other,and consequently to firmly grip the ways B, and thereby arrest the descent of the car. Owing to the fact that the gripping-jaws proper, J, are mounted upon inclined ways c, the downward motion of the car will tend to wedge these jaws yet more firmly against the ways B, and

thereby increase the efficiency of the gripping mechanism.

It will thus be seen that,after the apparatus is once set to operate at any given speed, as soon as this speed is reached the brake will at once become operative and check the descent of the car, the entire action being automatic in its nature and positive and efficient in obtaining the results desired-to wit, the checking of the descent of the ear.

I have shown the governor-arms K as provided with shoulders k, in order to cause them to operate upon the latch J with greater certainty; but this construction is not absolutely necessary. It will also be obvious that various modifications in the details of construction may be made without departing from the principles of my invention, and I therefore do not wish to be understood as limiting myself strictly to the precise details hereinbefore described, and shown in the drawings.

Having described my invention, what I claim as new, and desire to secure by Letters Iatent, 1s-

1. In an elevator-brake, the combination, with the car and its ways, of the gripping-levers, the rods for operating said levers, the bell-crank levers connected to said rods and provided with worm-gearsegments, the wormshaft, the governor-wheel mounted loosely on said shaft and actuated by the movement of the car, and a friction-clutch provided with a suitable latch adapted to be tripped by the governor-arms to apply the brake, substantially as and for the purposes specified.

2. In an elevator-brake, the combination, with the car and its ways, of the gripping-levers and their operating-rods, the bell-,crank levers provided with worm-gear segments, the wormshaft and the governor-wheel loosely mounted thereon, and the spring-controlled friction-clutch held normally out of engagement with the governor-wheel by means of a suitable latch, the said latch being arranged in the path of the governor-arms when these latter are thrown outward, substantially as and for the purposes specified.

3. In an elevator-brake, the gri pping-levers arranged to clasp the upright ways, and the gripping-jaws consisting of inclined or wedgeshaped blocks mounted on the jaws of the grip- IOO IIO

ping-levers and movable vertically thereon independent of the levers, substantially as and for the purposes specified.

4. In an elevator-brake, the combination, with the gripping-levers C, having dovetailed Ways c, inclined, as described,of the grippingjaws C3, mounted to slide on said ways, the springs 0*, to draw said jaws downward, and the stops c, substantially as' and for the purposes specified.

5. In an elevator-brake, the combination, with the gripping-levers pivoted as described, of the sliding rods D, provided with conical or wedge-shaped extremities D,passing between the inner ends of the gripping-levers, substantially as and for the purposes specied.

6. In an elevator-brake, the combination, with the worm G and its shaft G', of the friction-wheel H, splined on said shaft, the spring I-I,bearing against said friction-wheel,the bellcrank lever Lhaving one arm connected to the hub of the friction-wheel, thelatch J, engaging the other arm of the bell-crank lever, and the governor-wheel K, provided with the pivoted and spring-controlled arms K,adapted to engage the latch J when thrown outward, substantially as and for the purposes specified.

7. In an elevator-brake, the link belt L, in combination with the metallic governor-*wheel K, provided with sockets in its periphery,the rubber band K5,surrounding the said wheel and having openings corresponding tothe sockets therein, and the independent wooden teeth or .sprockets k6 on the outside of the said band and provided with shanks extending through the same and seated in the sockets of the wheel, substantially as and for the purposes specified.

RALPH L. TEED. Witnesses:

W. G. CoRLIEs, IRVINE MILLER. 

